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Número de publicaciónUS5069970 A
Tipo de publicaciónConcesión
Número de solicitudUS 07/451,704
Fecha de publicación3 Dic 1991
Fecha de presentación18 Dic 1989
Fecha de prioridad23 Ene 1989
TarifaPagadas
Número de publicación07451704, 451704, US 5069970 A, US 5069970A, US-A-5069970, US5069970 A, US5069970A
InventoresTheodore Largman, Frank Mares, Clarke A. Rodman
Cesionario originalAllied-Signal Inc.
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Fibers and filters containing said fibers
US 5069970 A
Resumen
This invention relates to a fiber comprising a major amount of a continuous phase comprising one or more melt processible polyesters of fiber forming molecular weight, and a minor amount of one or more polyolefins non-uniformly dispersed in said continuous phase such that the concentration of polyolefins at or near the surface of said fiber is greater than the concentration of polyesters at or near the surface of said fiber, and a process for preparing said fiber.
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Reclamaciones(31)
What is claimed is:
1. A fiber comprising a continuous phase of one or more melt processible polyesters of fiber forming molecular weight and one or more melt processible polyolefins selected from the group consisting of polypropylene, polybutylene and polyisobutylene non-uniformly dispersed therein, wherein the weight percent of polyolefin within 50 Å of the surface of said fiber is at least about 50 weight percent based on the total weight of said fiber within said about 50 Å of the surface of the fiber.
2. A fiber according to claim 1 wherein said polyester is formed from the condensation of an aliphatic or cycloaliphatic diol, and an aromatic dicarboxylic acid.
3. A fiber according to claim 2 wherein said aromatic dicarboxylic acid is selected from the group consisting of terephthalic acid, isophthalic acid and orthophthalic acid.
4. A fiber according to claim 3 wherein said aromatic dicarboxylic acid is terephthalic acid.
5. A fiber according to claim 2 wherein said diol is an aliphatic diol.
6. A fiber according to claim 1 wherein said polyester is selected from the group consisting of poly(ethylene terephthalate), poly(butylene terephthalate) and poly(1,4-cyclohexane dimethylene terephthalate).
7. A fiber according to claim 6 wherein said polyester is poly(ethylene terephthalate).
8. A fiber according to claim 1 wherein said polyolefin is polypropylene.
9. A fiber according to claim 1 wherein the amount of said polyolefins in said fiber is from about 0.5 to about 25 weight percent based on the total weight of the fiber.
10. A fiber according to claim 9 wherein the amount of said polyolefins in said fiber is from about 1 to about 15 weight percent.
11. A fiber according to claim 10 wherein the amount of said polyolefins in said fiber is from about 2.5 to about 10 weight percent.
12. A fiber according to claim 11 wherein the amount of said polyolefins in said fiber is from about 3 to about 8.5 weight percent.
13. A fiber according to claim 1 wherein the amount of said polyolefin within said about 50 Å of the surface of said fiber is at least about 80 percent by weight.
14. A fiber according to claim 13 wherein the amount of said polyolefin within said about 50 Å of the surface of said fiber is at least about 85 percent by weight.
15. A fiber according to claim 1 wherein said polyolefin is of fiber forming molecular weight.
16. The fiber according to claim 14 wherein the amount of said polyolefin within said about 50 Å of the surface of said fiber is from about 85 percent by weight to about 98 percent by weight.
17. A fiber according to claim 1 wherein said fiber is a filament or a plurality of filaments.
18. A fiber according to claim 17 wherein said fiber is a filament of substantially circular cross section.
19. A fiber according to claim 17 wherein said fiber is a filament of multilobal cross section.
20. A fiber according to claim 19 wherein said multilobal fiber has at least about 3 irregular or regular lobes or vanes projecting from the longitudinal axis of said fiber.
21. A fiber according to claim 20 wherein said fiber has at least about 4 projecting lobes or vanes.
22. A fiber according to claim 19 wherein the mod ratio of the fiber is at least about 1.8.
23. A fiber according to claim 22 wherein the mod ratio of the fiber is from about 2.0 to about 7.0.
24. A fiber according to claim 23 wherein the mod ratio of the fiber is from about 2.2 to about 5.
25. A fiber which comprises a major amount of a continuous phase comprising one or more melt processible polyesters of fiber forming molecular weight and a minor amount of one or more melt processible polyolefins non-uniformly dispersed in said continuous phase such that the concentration of said polyolefins within at least 50 Å of the surface of said fiber is greater than the concentration of said polyesters within at least 50 Å of the surface of said fiber, wherein said fiber is multi-lobal having at least 4 irregular or regular shaped lobes or vanes projecting from the longitudinal axis of said fiber.
26. A fiber according to claim 25 wherein:
said polyolefin is polypropylene and said polyester is poly(ethylene terephthalate); and
said polyolefin in said fiber is from about 0.5 to about 25 weight percent based on the total weight of the fiber and wherein the weight percent of polyolefin within said about 50 Å of the surface of the fiber is at least about 85 percent by weight based on the total weight of said fiber within 50 Å of the surface of the fiber.
27. A fiber according to claim 25 wherein said fiber is hexalobal.
28. A fiber according to claim 26 wherein the amount of polypropylene within said about 50 Å of the surface of said fiber is from about 85% to about 98% by weight.
29. A fiber according to claim 28 wherein the amount of polypropylene in said fiber is from about 1 to about 15% by weight.
30. A fiber according to claim 29 wherein the amount of in said fiber polypropylene is from about 2.5 to about 10% by weight.
31. A fiber according to claim 30 wherein the amount of in said fiber polypropylene is from about 3 to about 8.5% by weight.
Descripción

This application is a division of application Ser. No. 300,194, filed 1/23/89, now U.S. Pat. No. 4,908,052, which is a continuation of U.S. Ser. No. 040,446, filed 4/20/87.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to improved filter fibers and filters comprising said fibers. More particularly, this invention relates to such filter fibers comprising a polyester and a polyolefin, and filters comprising said fibers.

2. Prior Art

Polyesters are well known materials for the manufacture of fibers. Illustrative of such fibers are those described in U.S. Pat. Nos. 4,454,196; 4,410,473; and 4,359,557.

Polyolefinic materials are well known articles of commerce which have experienced wide acceptance in forming shaped objects and film or sheet material. The use of such materials has extended to the fiber and fabric industries. For example, U.S. Pat. Nos. 4,587,154; 4,567,092; 4,562,869; and 4,559,862.

Fibers containing mixtures of polyolefins and polyesters are known. For example, U.S. Pat. No. 3,639,505 describes fibers and films composed of a polymer alloy comprising an intimate blend of polyolefin, a minor amount of polyethylene terephthalate and 0.2 to 5 parts per hundred parts of polymer of a toluene sulfonamide compound which are described as having improved receptivity to dispersed dyes.

Bicomponent fibers are known in the art. For example, Textile World, June 1986 at page 29 describes sheath/core fibers which have an inner core of polyester and have an outer core of polypropylene or polyethylene. Also see Textile World, April 1986, page 31.

Bicomponent textile filaments of polyester and nylon are known in the art, and are described in U.S. Pat. No. 3,489,641. According to the aforesaid patent, a yarn that crimps but does not split on heating is obtained by using a particular polyester.

It is also known to employ as the polyester component of the bicomponent filament a polyester which is free from antimony, it having been determined that antimony in the polyester reacts with nylon to form a deposit in the spinneret which produces a shorter junction line, and thus a weaker junction line. Such products are claimed in U.S. patent application Ser. No. 168,152, filed July 14, 1980.

It is also known to make bicomponent filaments using poly[ethylene terephthalate/5-(sodium sulfo) isophthalate] copolyester as the polyester component. U.S. Pat. No. 4,118,534 teaches such bicomponents.

It is also known to make bicomponent filaments in which the one component partially encapsulates the other component. U.S. Pat. No. 3,607,611 teaches such a bicomponent filament.

It is also known to produce bicomponent filaments in which the interfacial junction between the two polymeric components is at least in part jagged. U.S. Pat. No. 3,781,399 teaches such a bicomponent filament. Bicomponent filaments having a cross sectional dumbell shape are known in the art. U.S. Pat. No. 3,092,892 teaches such bicomponent filaments. Other nylon/polyester bicomponent fibers having a dumbell cross sectional shape having a jagged interfacial surface, the polyester being an antimony-free copolyester having 5-(sodium sulfo) isophthalate units are known. U.S. Pat. No. 4,439,487 teaches such fibers. The surface of such bicomponent filament is at least 75% of one of the polymeric components. Still other nylon/polyester bicomponent sheath/core fibers are described in Japan Patent Nos. 49020424, 48048721, 70036337 and 68022350; and U.S. Pat. Nos. 4,610,925, 4,457,974 and 4,610,928.

Fibers have previously been prepared from blends of polyamides with minor amounts of polyesters such as poly(ethylene terephthalate). Intimate mixing before and during the spinning process has been recognized as necessary to achieve good properties in such blended fibers. It is furthermore known that the fine dispersions in fibers of polymer blends are achieved when both phases have common characteristics such as melt viscosity. See D. R. Paul, "Fibers From Polymer Blends" in Polymer Blends, vol. 2, pp. 167-217 at 184 (D. R. Paul & S. Newman, ehs., Academic Press 1978)

Graft and block copolymers of nylon 6/nylon 66, nylon 6/poly(ethylene terephthalates) and nylon 6/poly(butylene terephthalate) have been formed into grafts which can be spun into fibers For example, U.S. Pat. No. 4,417,031, and S. Aharoni, Polymer Bulletin, vol. 10, pp. 210-214 (1983) disclose a process for preparing block and/or graft copolymers by forming an intimate mixture of two or more polymers at least one of which includes one or more amino functions, as for example a nylon, and at least one of the remaining polymers includes one or more carboxylic acid functions, as for example a polyester, and a phosphite compound; and thereafter heating the intimate mixture to form the desired block and/or graft copolymers. U.S. Pat. No. 4,417,031 disclose that such copolymers can be spun into fibers.

The use of polyester fibers as the filter element for air filters of air breathing engines is known. For example, the use of such fibers is described in Lamb, George, E. R. et al., "Influence of Fiber Properties on the Performance of Nonwoven Air Fillers," Proc. Air Pollut. Control Assoc., vol. 5, pp. 75-57 (June 15-20; 1975) and Lamb, George E. R. et al. "Influence of Fiber Geometry on the Performance of Non Woven Air Filters," Textile Research Journal," vol. 45 No. 6 pp. 452-463 (1975).

SUMMARY OF THE INVENTION

The present invention is directed to a polyester based fiber useful for the filter element of air filters. More particularly, this invention comprises a polymer fiber comprising predominantly one or more melt spinnable polyesters having non uniformly dispersed therein one or more polyolefins; the concentration of said polyolefin at or near the outer surface of said fiber being greater than the concentration of said polyester at or near the surface of the fiber. As used herein, a "fiber" is an elongated body, the length dimension of which is greater than the transverse dimensions of width and thickness. Accordingly, the term fiber includes single filament, ribbon, strip and the like, having regular or irregular cross-section. The fiber of this invention exhibits improved capacity when used as the fibers of the filter element of an air filter.

Yet another aspect of this invention relates to a process of forming the fiber of this invention which comprises melt spinning a molten mixture comprising as a major component one or more melt spinnable polyesters and as a minor component one or more polyolefins forming a polymer fiber comprising predominantly said one or more polyesters having non uniformly dispersed therein said one or more polyolefins, the concentration of said polyolefins being greater at or near the outer surfaces of said fiber being greater than the concentration of said polyesters at or near the center of said fiber. Surprisingly, it has been discovered that during the melt spinning of the fibers, a portion of the polyolefins migrates to the surface of the fiber such that even though it is the minor component, the concentration of the polyolefins at or near the surface of the polyolefins at or near the surface of the fiber is greater than the concentration of polyesters at or near the surface.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 10 are cross-sections of various "Multilobal" fibers for use in this invention.

DESCRIPTION OF THE INVENTION

The fiber of this invention comprises two essential components. The fiber is predominantly a melt processible polyester of "fiber forming molecular weight." As used herein, "fiber forming molecular weight" is a molecular weight at which the polymer can be melt spun into a fiber Such molecular weights are well known to those of skill in the art and may vary widely depending on a number of known factors, including the specific type of polymer. In the preferred embodiments of the invention, the molecular weight of the polyester is at least about 5,000, and in the particularly preferred embodiments the molecular weight of the polyester is from about 8,000 to about 100,000. Amongst these particularly preferred embodiments, most preferred are those embodiments in which the molecular weight of the polyester is from about 15,000 to about 50,000.

Polyester useful in the practice of this invention may vary widely. The type of polyester is not critical and the particular polyester chosen for use in any particular situation will depend essentially on the physical properties and features, i.e., desired in the final filter element Thus, a multiplicity of linear thermoplastic polyesters having wide variations in physical properties are suitable for use in this invention.

The particular polyester chosen for use can be a homo-polyester or a co-polyester, or mixtures thereof as desired. Polyesters are normally prepared by the condensation of an organic dicarboxylic acid and an organic diol, and, therefore illustrative examples of useful polyesters will be described hereinbelow in terms of these diol and dicarboxylic acid precursors.

Polyesters which are suitable for use in this invention are those which are derived from the condensation of aromatic, cycloaliphatic, and aliphatic diols with aliphatic, aromatic and cycloaliphatic dicarboxylic acids. Illustrative of useful aromatic diols, are those having from about 6 to about 12 carbon atoms. Such aromatic diols include bis-(p-hydroxyphenyl) ether; bis-(p-hydroxyphenyl) thioether; (bis-(p-hydroxyphenyl)-sulphone; bis-(p-hydroxyphenyl)-methane; 1,2-(bis-(p-hydroxyphenyl)-ethane; 1-phenyl-(p-hydroxyphenyl)-methane; diphenyl-bis(p-hydroxyphenyl)methane; 2,2-bis(4'-hydroxy-3'-dimethylphenyl)propane; 1,1- bis(p-hydroxyphenyl)-butane; 2,2-(bis(p-hydroxyphenyl)-butane; 1,1-(bis-(p-hydroxyphenyl)cyclopentene; 2,2-(bis-(p-hydroxyphenyl)-propane (bisphenol A); 1,1-(bis-(p-hydroxyphenyl)-cyclohexane (bisphenol C); p-xylene glycol; 2,5 dichloro-p-xylylene glycol; p-xylene-diol; and the like.

Suitable cycloaliphatic diols include those having from about 5 to about 8 carbon atoms. Exemplary of such useful cycloaliphatic diols are 1,4-dihydroxy cyclohexane; 1,4-dihydroxy methylcyclohexane; 1,3-dihydroxycyclopentane; 1,5-dihydroxycycloheptane; 1,5-dihydroxycyclooctane; 1,4-cyclohexane dimethanol; and the like. Polyesters which are derived from aliphatic diols are preferred for use in this invention. Useful and preferred aliphatic and cycloaliphatic diols includes those having from about 2 to about 12 carbon atoms, with those having from about 2 to about 6 carbon atoms being particularly preferred. Illustrative of such preferred diol precursors are propylene glycols; ethylene glycol, pentane diols, hexane diols, butane diols and geometrical isomers thereof. Propylene glycol, ethylene glycol, 1,4-cyclohexane dimethanol, and 1,4-butanediol are particularly preferred as diol precursors of polyesters for use in the conduct of this invention.

Suitable dicarboxylic acids for use as precursors in the preparation of useful polyesters are linear and branched chain saturated aliphatic dicarboxylic acids, aromatic dicarboxylic acids and cycloaliphatic dicarboxylic acids. Illustrative of aliphatic dicarboxylic acids which can be used in this invention are those having from about 2 to about 50 carbon atoms, as for example, oxalic acid, malonic acids, dimethyl-malonic acid, succinic acid, octadecylsuccinic acid, pimelic acid, adipic acid, trimethyladipic acid, sebacic acid, suberic acid, azelaic acid and dimeric acids (dimerisation products of unsaturated aliphatic carboxylic acids such as oleic acid) and alkylated malonic and succinic acids, such as octadecylsuccinic acid, and the like.

Illustrative of suitable cycloaliphatic dicarboxylic acids are those having from about 6 to about 15 carbon atoms. Such useful cycloaliphatic dicarboxylic acids include 1,3-cyclobutanedicarboxylic acid, 1,2-cyclopentanedicarboxylic acid, 1,3- and 1,4-cyclohexanedicarboxylic acid, 1,3- and 1,4-dicarboxymethylcyclohexane and 4,4'-dicyclohexydicarboxylic acid, and the like.

Polyester compounds prepared from the condensation of a diol and an aromatic dicarboxylic acid are preferred for use in this invention. Illustrative of such useful aromatic carboxylic acids are terephthalic acid, isophthalic acid and a o-phthalic acid, 1,3-, 1,4-, 2,6 or 2,7-naphthalnedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenylsulphone-dicarboxylic acid, 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)-indane, diphenyl ether 4,4'-dicarboxylic acid bis-p(carboxyphenyl)methane and the like. Of the aforementioned aromatic dicarboxylic acids, those based on a benzene ring such as terephthalic acid, isophthalic acid, and ortho-phthalic acid are preferred for use and amongst these preferred acid precursors, terephthalic acid is particularly preferred.

In the most preferred embodiments of this invention, poly(ethylene terephthalate), poly(butylene terephthalate), and poly(1,4-cyclohexane dimethylene terephthalate), are the polyesters of choice. Among these polyesters of choice, poly(ethylene terephthalate is most preferred.

The amount of polyester included in the fiber of this invention may vary widely In general, the amount of polyester will vary from about 99.5 to about 75 percent by weight based on the total weight of the fiber. In the preferred embodiments of the invention the amount of polyester in the fiber may vary from about 99 to about 85 percent by weight based on the total weight of the fiber, and in the particularly perferred embodiments of the invention the amount of polyester in the fiber may vary from about 90 to about 98 weight percent on the aforementioned basis. Amongst these partcularly preferred embodiments, most preferred are those embodiments in which the amount of polyester in the fiber is from about 92 to about 95 weight percent based on the total weight of the fiber.

As a second essential component, the fiber of this invention includes one or more polyolefins. The molecular weight of the polyolefin may vary widely. For example, the polyolefin may be a wax having a relatively low molecuar weight i.e., 500 to 1,000 or more. The polyolefin may also be melt spinnable and of fiber forming molecular weight. Such polyolefins for use in the practice of this invention are well known. Usually, the polyolefin is of fiber forming molecular weight having a molecular weight of at least about 5,000. In the preferred embodiments of the invention the molecular weight of the polyolefins is from about 8,000 to about 1,000,000 and in the particularly preferred embodiments is from about 25,000 to about 750,000. Amongst the particularly preferred embodiments most preferred are those in which the molecular weight of the polyolefins is from about 50,000 to about 500,000. Illustrative of polyolefins for use in the practice of this invention are those formed by the polymerization of olefins of the formula:

R1 R2 CH=CH2 

wherein:

R1 and R2 are the same or different and are hydrogen or substituted or unsubstituted alkylphenyl, phenylalkyl, phenyl, or alkyl. Useful polyolefins include polystyrene, polyethylene, polypropylene, polyl(1-octadecene), polyisobutylene, poly(1-pentene), poly(2-methylstyrene), poly(4-methylstyrene), poly(1-hexene), poly(5-methyl-1-hexene), poly(4-methylpentene), poly(1-butene), poly(3-methyl-1-butene), poly(3-phenyl-1-propene), polybutylene, poly(methyl pentene-1), poly(1-hexene), poly(5-methyl-1-hexene), poly(1-octadecene), poly(vinyl cyclopentane), poly(vinylcyclohexane), poly(a-vinylnaphthalene), and the like.

Preferred for use in the practice of this invention are polyolefins of the above referenced formula in which R is hydrogen or alkyl having from 1 to about 12 carbon atoms such as polyethylene, polypropylene, polyisobutylene, poly(4-methyl-1-pentene), poly(1-butene), poly(1-pentene), poly(3-methyl-1-butene), poly(1-hexene), poly(5-methyl-1-hexene), poly(1-octene), and the like.

In the particularly preferred embodiments of this invention, the polyolefins of choice are those in which R1 is hydrogen and R2 is hydrogen or alkyl having from 1 to about 8 carbon atoms such as polyethylene, polypropylene, poly(isobutylene), poly(1-pentene), poly(3-methyl-1-butene), poly(1-hexene), poly(4-methyl-1-pentene), and poly(1-octene). Amongst these particularly preferred embodiments, most preferred are those embodiments in which R1 is hydrogen and R2 is hydrogen or alkyl having from 1 to about 6 carbon atoms such as polyethylene, polypropylene, poly(4-methyl-1-pentene), and polyisobutylene, with polypropylene being the polyolefin of choice.

The amount of polyolefins included in the fiber of the invention may vary widely and is usually from about 0.5 to about 25 percent by weight based on the total weight of the fiber. In the preferred embodiments of this invention, the amount of melt spinnable polyolefins is from about 1 to about 15 weight percent based on the total weight of the fiber; and in the particularly preferred embodiments of the invention the amount of melt spinnable polyolefins in the fiber is from about 2 to about 10 weight percent based on the total weight of the fiber. Amongst the particularly preferred embodiments, most preferred are those embodiments in which the amount of melt spinnable polyolefins is from about 3 to about 8.5 percent by weight based on the total weight of the fiber.

Surprisingly, it has been discovered that in the fiber of this invention the polyolefins are not uniformly dispersed throughout the polyester continuous phase. Rather, the concentration of the melt spinnable polyolefins at or near the surface of the fiber is higher than the concentration of the melt spinnable polyester at or near the surface of the fiber. The result is a fiber which when used in a fiber filter element has a higher capacity and efficiency as compared to polyester fibers which do not contain melt spinnable polyolefins. As used herein "at or near" the surface of the fiber is at least about 50 Å of the fiber surface. In the preferred embodiments of this invention, the weight percent of the polyolefin component in the portion of the fiber forming a sheath about all or a portion of the longitudinal axis of the fiber said sheath having a thickness of at least about 50 Å is at least about 50 weight percent based on the total weight of the sheath. In the particularly preferred embodiments of the invention, the amount of polyolefins contained in said sheath is at least about 80 percent by weight based on the total weight of the sheath, and in the most preferred embodiments the amount of polyolefins contained in the sheath is at least about 85 weight percent to about 98 weight percent being the amount of choice.

Various other optional ingredients, which are normally included in polyester fibers, may be added to the mixture at an appropriate time during the conduct of the process. Normally, these optional ingredients can be added either prior to or after melting of the polyester or polyolefin or a mixture of the polyester and polyolefin Such optional components include fillers, plasticizers, colorants, mold release agents, antioxidants, ultra violet light stabilizers, lubricants, anti-static agents, fire retardants, and the like. These optional components are well known to those of skill in the art, accordingly, only the preferred optional components will be described herein in detal.

While certain cross-sections are preferred for certain uses, in general the cross-sectional shape of the fiber is not critical and can vary widely. The fiber may have an irregular cross section or a regular cross section. For example, the fiber can be flat sheets or ribbons, regular or irregular cylinders, or can have two or more regular or irregular lobes or vanes projecting from the center of axis of the fiber, such fibers are hereinafter referred to as "multilobal" fibers. Illustrative of such multilobal fibers are trilobal, hexalobal, pentalobal, tetralobal, and octalobal filament fibers. In the preferred embodiments of the invention the fibers are filament fibers having a multilobal cross section such that the surface area of the fiber is maximized, such as fibers having the representative cross-sections depicted in FIGS. 1 to 10. Illustrative of such preferred fibers are those fibers which are multilobal and having at least about three projecting lobes, or vanes or projections, and in the particularly preferred embodiments of the invention the fiber is multilobal having at least about five projecting lobes, vanes or projections such as hexalobal or octalobal fibers.

In the preferred embodiments of the invention in which fibers are multilobal, the "modification ratio" of the fiber can affect the effectiveness of the fiber as the filter element of a filter. As used herein, the "modification ratio" is the ratio of the average distance from the tip of the lobes or vanes of the fiber to the longitudinal center of axis of the fiber to the average distance from the base of the lobes or vanes of the fiber to the longitudinal center of axis of the fiber. In general, the greater the modification ratio of the fiber, the greater the effectiveness of the fiber as a filtering element; and conversely, the less the modification ratio of the fiber, the less its effectiveness as a filtering element. In the preferred embodiments of the invention, the modification ratio of the fiber is at least about 18, and in the particularly preferred embodiments of the invention is from about 2 to about 7. Amongst these preferred embodiments, most preferred are those embodiments in which the modification ratio of the fiber is from about 2.2 to about 5.

In the preferred embodiments of this invention, foamed fibers are implied in the fabrication of the filter elements. Such foamed fibers can be prepared by using conventional foaming techniques, as for example U.S. Pat. Nos. 4,562,022, 4,544,594, 4,380,594 and 4,164,603.

The fiber of this invention is prepared by the process of this invention which comprises:

(a) forming a molten mixture comprising as a major amount one or more polyesters of fiber forming molecular weight and as a minor amount of one or more polyolefins; and

(b) melt spinning said mixture to form a fiber which comprises a major amount of a continuous phase comprising said polyesters and a minor amount of said polyolefins non-uniformly dispersed in said continuous phase such that the concentration of said polyolefins at or near the surface of said fiber is greater than the concentration of said polyesters at or near the center of said fiber.

A molten mixture is formed in the first process step. As used herein, "molten mixture" is an intimate mixture which has been heated to a temperature which is equal to or greater than the melting point of the highest melting polymer component of the mixture or an intimate mixture formed by melting one polymer and dispersing the other polymer in the melted polymer. The manner in which the molten mixture is formed is not critical and conventional methods can be employed. For example, in the preferred embodiments of the invention, the molten mixture can be formed through use of conventional polymer and additive blending means, in which the polymeric components are heated to a temperature equal to or greater than the melting point of the highest melting polymer, and below the degradation temperature of each of the polymers.

In the preferred embodiment, the components of the intimate mixture can be granulated, and the granulated components mixed dry in a suitable mixer, as for example a tumbler or a Branbury Mixer, or the like, as uniformly as possible. Thereafter, the composition is heated in an extruder until the polymer components are melted.

Fibers can be melt spun from the molten mixture by conventional spinning techniques. For example, the compositions can be melt spun in accordance with the procedures of U.S. Pat. Nos. 4,454,196 and 4,410,473. Foamed fibers can be melt spun using conventional procedures, as for example by the procedures of U.S. Pat. Nos 4,562,022 and 4,164,603.

The fibers produced from the composition of this invention can be employed in the many applications in which synthetic fibers are used, and are particularly suited for use in the fabrication of filter elements of various types of air and liquid filters, such as air and liquid filters for industrial applications as for example filters for internal combustion engines, clarification filters for water and other liquids, compressed air filters, industrial air filters and the like employing conventional techniques. Fibers of this invention exhibit enhanced capacity and efficiency when are used as filter elements, as compared to polyesters which do not include minor amounts of the polyolefin.

The fibers of this invention are also useful in the fabrication of coverstock. For example, such fibers can be used as coverstock for absorbant materials in the manufacture of diapers, incontinence pads and the like.

The following examples are presented to more particularly illustrate the invention and should not be construed as limitations thereon.

EXAMPLES I to VI Fibers Containing Polyethylene Terephthalate and Polypropylene and Containing Polyethylene Terephthate and Poly Methylpentene

Polyethylene terephthalate (PET) received from St. Jude as chopped preforms was granulated into 1/8" (0.3175 cm) to 1/4" (0.635 cm) pieces which were then dried in a Stokes vacuum tray drier at 0.5 mm Hg for 16 hrs. at 160° C. The dry PET was sealed in a jar along with a polyolefin and tumbled for fifteen minutes for uniform blending. The anhydrous mixture was placed in the hopper of a one inch (2.54 cm) diameter MPM extruder which was preheated to the desired temperature profile along the barrel of the extruder to yield a polymer melt temperature at the exit of the extruder of about 540° F. (282° C.). The screw was 1 inch (2.54 cm) in diameter and 30 inches (76.2 cm) long with a 4:1 compression ratio. It had a standard feed screw configuration with a modified mixing section consisting of a four inch (10.2 cm) long cross hatched zone located seven inches (17.8 cm) from the end of the screw. The extruder was equipped with a metering pump and a spinning block containing screens (eight layers, 90, 200, 200, 200, 200, 200, 200, 90 mesh top to bottom) and a spinnerette. The spinnerette had twenty (20) symmetrical hexalobal orifices, wherein each lobe has dimension of 4 mils (0.1 mm) (width) x 25 mils (0.635 mm) (length)×20 mils (0.508 mm) (depth). The polymer mixture was extruded at a rate of 13 g/min. The filaments exiting from the spinnerette orifices were drawn down while being cooled in air to a temperature at which the filaments did not stick to the surface of a first take-up roll. Just above the first take-up roll, a finish was applied to the yarn to aid further processing and to dissipate any static charge buildup. The yarn on the first take-up roll was then drawn in line. The yarn on the first take-up roll which turned at 1670 rpm (2800 ft/sec) (853 m/sec) yarn speed was advanced to a second roll which turned at 4482 rpm (6500 ft/sec) (1981 m/sec) and from a second roll onto a third roll which turned also at 4482 rpm (6500 ft/sec) (1981 m/sec). The yarn was then advanced from the third roll to a Leesona winder at 6500 ft/sec (1981 m/sec), which wound the yarn upon a sleeve. The temperature of the rolls (heated by induction heating) were 120° C., 160° C. and 23° C. for rolls 1, 2 and 3 respectively. The results are set forth in the following Table I.

              TABLE I______________________________________   Amount of  Amount of    wt %Ex. No. PET(g)     Polymer(g)   Polymer______________________________________I       1900 g     100 g   PP1                             5%    PPII      975 g      25 g    PP     2.5%  PPIII     925 g      75 g    PP     7.5%  PPIV      950 g      50 g    PMP2                             5%    PMPV       925 g      75 g    PMP    7.5%  PMPVI      962.5 g    37.5 g  PMP    3.75% PMP______________________________________ 1 "PP" is spinning grade polypropylene obtained from Soltex Corporation under the trade name Soltex 3606. 2 "PMP" is spinning grade polymethylpentene obtained from Mitsui Corporation under the trade name TPX.
COMPARATIVE EXAMPLE I Fibers Containing polycaprolactam And Polypropylene

Using the procedure of Examples I to VI, 950 g of spinning grade polycaprolactam obtained from Allied Corporation under the trade name Capron® LSB, and 50 grams of spinning grade polypropylene obtained from SOLTEX Corporation under the trade name Soltex® 3606, were mixed and melt spun to obtain a 15 denier fiber containing five percent by weight of polypropylene.

COMPARATIVE EXAMPLE II Analysis and Determination of the Nature of the Dispersion of the Components in the Fiber

A series of experiments were conducted to illustrate the unique nature of fibers containing polyethylene terephthalate and a polyolefin as compared to fibers containing polycaprolactam and such polymers. The fibers of this invention selected for testing are those of Examples III and IV, and the nylon based fiber selected for testing is that of Comparative Example I. In these experiments, x-ray Photoelectron Spectroscopy (XPS) studies were carried out to determine the distribution of the minor amount of the polyolefin in the fiber Procedure employed was as follows: The above fibers were wrapped around a strip of molybdenum foil in order to provide a support for mounting on the sample holder. After introduction into the analysis chamber of the spectrometer, liquid nitrogen was passed through the sample holder to cool the specimen to a temperature of ca. -70° C. as measured by a thermocouple. The analysis was performed on a PHI Model 560 electron spectrometer using MgK α radiation as the excitation source.

In addition, spectra of the pure PET, PP, nylon and PMP were taken for reference. Calculations of the surface composition were based on fitting of lineshapes of the pure components to the convoluted envelope of the mixture. As a secondary measure of the composition, peaks heights ratios were used for those cases involving PET utilizing the C═0 and C--H peaks for determination of the relative quantity of PET. Agreement between the two methods of calculation was within 10%. Estimates of the sampling depth for the samples are on the order of 50-60 Å. In order to minimize decomposition under X-ray exposure, the samples were cooled to a temperature of ca. -70° C. during analysis.

The results indicated that the distribution of PP was substantially uniform in the fiber containing 5% PP (bulk concentration) of Comparative Example I and no segregation of PP at or near the surface regions of the fiber was not detected. For PET/7.5% PP fibers of Example III, the PP concentration within that portion of the fiber from 50 to 60 Å of the surface was determined to be 95-100% and the concentration of PET within this region was from 5 to 0%. This indicated that in contrast to the nylon/PP fiber of Comparative Example I, the concentration of PP in that region within 60 Å of the surface of the fiber is greater than the concentration of PET within that region, even though the concentration of PET within the fiber as a whole is very much greater than that of PP. Similarly, for PET/5% PMP fibers of Example IV, the concentration in the region within 60 Å of the surface of the fiber was determined to be 85-90%, while concentration of PET in this region was 15-10%. For the present experiments, it was not possible to determine if the PP or PMP distribution is homogeneous throughout the analysis volume or if a concentration gradient existed.

EXAMPLE VII

A series of experiments were carried out to compare the efficacy of the fibers of this invention as filter mediums to the efficacy of polyester alone for such use. Filter media used in these experiments were fabricated as follows:

The experimental fibers were crimped or texturized and cut into staple length of approximately 11/2 inch (3.81 cm). The fibers were pre-opened on a roller top card and blended with 3DPF 11/4 inch (3.17 cm) staple crimped Vinyon Fibers (a copolymer binding fiber comprising 85% polyvinyl chloride 15% polyvinyl acetate). The blend comprising 2/3 by weight of the experimental fiber or control fiber and 1/3 by weight of the binder fiber. A 6 ounce/yd2 (0.02g/cm2) air laid batting was made on a 12 inch wide laboratory air laying machine known as a Rando Webber. The air laid batting was needle locked on a needle punching machine. The needle locked batting was then needle punched to a spun bonded material known as DuPont's Reemay® 2470, a 3 ounce/yd2 (0.01g/cm2) fabric. Two control fibers were employed: (1) A 3,DPF trilobal cross section DuPont Dacron® Polyester Fiber (crimped, 11/2 inch (3.81 cm) staple length) and (2) and experimental 3DPF 100% polyester 3 DPF hexalobal cross section fiber crimped or texturized and cut into a 11/2 inch (3.81 cm) staple length. Both the unbacked needle locked air laid batting, and the reemay backed batting were heat stabilized for 5 minutes at 275° F. (135° C.) in a mechanical convection oven prior to flat sheet filtration performance testing.

After fabrications the filter mediums were evaluated. The properties selected for evaluation were capacity and efficiency because these properties are ultimately determinative of the effectiveness of a filter medium. The procedure employed is as follows:

On a flat sheet test apparatus, a 61/2"×61/2" (16.5 cm×16.5 cm) specimen was clamped A 4×4 (10.16 cm×10.16 cm) mesh screen was used to support the unbacked test specimen; no screen was used to support the Reemay® backed test specimen. A six inch (15.24 cm) diameter circle of the test specimen was subjected to an air flow of 25 CFM AC dust fine or coarse (1.0 g/in) was interspersed into the air stream by a feeder-aspirator mechanism. Air flow was straigtened by a horn to produce uniform air flow velocity or laminar flow through the specimen. A tared absolute filter consisting of a micro glass phenolic bonded batting classified as AF 31/2 inch (8.9 cm) by the fiber glass insulation industry, 10 inches (25.4 cm) in diameter below the test specimen was used for determining AC dust removal efficiency. The backed specimens were run until a 10 inch (25.4 cm) of water rise in pressure differential across the specimen is reached.

The test contaminant was a natural siliceous granular powder obtained from the Arizona desert classified to a specific particle size distribution and marketed by the AC Spark Plug Division of General Motors. The particle size distributions of the two test dusts are set forth in the following Table II.

              TABLE II______________________________________AC Fine                AC CoarseParticle               ParticleSize (μm)     %            Size (μm)                            %______________________________________5.5       <38 ± 3   5.5       <13 ± 311        <54 ± 3   11        <24 ± 322        <71 ± 3   22        <37 ± 344        <89 ± 3   44        <56 ± 388        --           88        <84 ± 3176       <100         176       <100______________________________________

Dust Removal efficiency of fine and coarse particles was determined by obtaining the weight increase of both the test specimen and the absolute filter: ##EQU1## Where W1 is the weight increase of the test specimen and W2 is the weight increase of the absolute filter.

Capacity is calculated as follows:

Capacity in=W1 

GMS

The results of this evaluation are set forth in the following Table III:

              TABLE III______________________________________Filter  AC Course Test Dust                   AC Fine Test DustMedium  Capacity  Efficiency                       Capacity                               Efficiency______________________________________Polyester.sup.(1)   12.9      99.3      8.29    99.0Polyester.sup.(2)   9.8       99.0      8.14    98.9Example I   15.34     99.3      8.17    99.0______________________________________ .sup.(1) The Polyester fiber is hexalobal. .sup.(2) The Polyester obtained from duPont Co. under the tradename Dacro ® is trilobal.   the tradename Dacron® is trilobal.
COMPARATIVE EXAMPLE III

A series of experiments were carried out to demonstrate that when a polyamide is substituted for a polyester in this invention, the polyolefin is more uniformly dispersed which results in inferior performance when used as a filter medium. The fiber of this invention used in the comparison study was the trilobal fiber prepared as described in Example I containing polyethylene terephthalate and 5% by weight PP, and the fiber of Comparative Example 1 containing polypoprolactam and 5% by weight PP.

The fibers were fabricated into a filter element and evaluated in accordance with the procedure of Example IV. The results are set forth in the following Table III.

              TABLE III______________________________________Filter  AC Course Test Dust                   AC Fine Test DustMedium  Capacity  Efficiency                       Capacity                               Efficiency______________________________________Nylon/PP   10.3      99.3      6.8     98.7Example I   15.34     99.3      8.17    99.0______________________________________
Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US3359344 *6 Jul 196419 Dic 1967Kurashiki Rayon CoMixed spun fibers containing polyamides or polyesters and a second component selected from the group of polyethylene, polypropylene or polystyrene
US3425893 *3 Ago 19654 Feb 1969Sims James GTextile filaments
US3498941 *22 Ago 19663 Mar 1970Ici LtdPolymeric dispersions of a polyolefin with an incompatible polymer and a polyamide dispersing agent
US3508390 *30 Sep 196828 Abr 1970Allied ChemModified filament and fabrics produced therefrom
US3549734 *27 Jun 196722 Dic 1970Takeshi YasudaMethod of forming microfibers
US3620892 *7 May 196816 Nov 1971Allied ChemDimensionally stable articles and method of making same
US3623939 *28 Jun 196830 Nov 1971Toray IndustriesCrimped synthetic filament having special cross-sectional profile
US3900549 *1 Jun 197319 Ago 1975Kuraray CoMethod of spinning composite filaments
US3923726 *9 Jun 19692 Dic 1975Minnesota Mining & MfgProcess of making colored high temperature polymers
US4424258 *24 Ene 19833 Ene 1984Monsanto CompanySelf-crimping multi-component polyester filament wherein the components contain differing amounts of polyolefin
US4609710 *19 Dic 19832 Sep 1986Teijin LimitedUndrawn polyester yarn and process for manufacturing
GB1194704A * Título no disponible
Citada por
Patente citante Fecha de presentación Fecha de publicación Solicitante Título
US5480710 *17 Mar 19952 Ene 1996E. I. Du Pont De Nemours And CompanyFiberballs
US5628736 *28 Sep 199513 May 1997The Procter & Gamble CompanyResilient fluid transporting network for use in absorbent articles
US5698322 *2 Dic 199616 Dic 1997Kimberly-Clark Worldwide, Inc.Multicomponent fiber
US5707735 *18 Mar 199613 Ene 1998Midkiff; David GrantMultilobal conjugate fibers and fabrics
US5762734 *30 Ago 19969 Jun 1998Kimberly-Clark Worldwide, Inc.Process of making fibers
US5770531 *29 Abr 199623 Jun 1998Kimberly--Clark Worldwide, Inc.Mechanical and internal softening for nonwoven web
US5811045 *25 Feb 199722 Sep 1998Kimberly-Clark Worldwide, Inc.Process of making multicomponent fibers containing a nucleating agent
US5820973 *22 Nov 199613 Oct 1998Kimberly-Clark Worldwide, Inc.Heterogeneous surge material for absorbent articles
US5843063 *22 Nov 19961 Dic 1998Kimberly-Clark Worldwide, Inc.Multifunctional absorbent material and products made therefrom
US5853881 *11 Oct 199629 Dic 1998Kimberly-Clark Worldwide, Inc.Elastic laminates with improved hysteresis
US5874160 *20 Dic 199623 Feb 1999Kimberly-Clark Worldwide, Inc.Macrofiber nonwoven bundle
US5879343 *22 Nov 19969 Mar 1999Kimberly-Clark Worldwide, Inc.Highly efficient surge material for absorbent articles
US5883231 *21 Ago 199716 Mar 1999Kimberly-Clark Worldwide, Inc.Artificial menses fluid
US5910545 *31 Oct 19978 Jun 1999Kimberly-Clark Worldwide, Inc.Biodegradable thermoplastic composition
US5916678 *16 Oct 199629 Jun 1999Kimberly-Clark Worldwide, Inc.Water-degradable multicomponent fibers and nonwovens
US5931823 *31 Mar 19973 Ago 1999Kimberly-Clark Worldwide, Inc.High permeability liner with improved intake and distribution
US5965468 *31 Oct 199712 Oct 1999Kimberly-Clark Worldwide, Inc.Direct formed, mixed fiber size nonwoven fabrics
US5976694 *3 Oct 19972 Nov 1999Kimberly-Clark Worldwide, Inc.Water-sensitive compositions for improved processability
US5985450 *22 Sep 199316 Nov 1999ShakespeareStriated monofilaments useful in the formation of papermaking belts
US5994615 *16 Dic 199830 Nov 1999Kimberly-Clark Worldwide, Inc.Highly efficient surge material for absorbent article
US6040255 *25 Jun 199621 Mar 2000Kimberly-Clark Worldwide, Inc.Photostabilization package usable in nonwoven fabrics and nonwoven fabrics containing same
US6098557 *23 Jun 19998 Ago 2000Kimberly-Clark Worldwide, Inc.High speed method for producing pant-like garments
US6121170 *17 Jun 199919 Sep 2000Kimberly-Clark Worldwide, Inc.Water-sensitive compositions for improved processability
US6152904 *22 Nov 199628 Nov 2000Kimberly-Clark Worldwide, Inc.Absorbent articles with controllable fill patterns
US617227625 Mar 19989 Ene 2001Kimberly-Clark Worldwide, Inc.Stabilized absorbent material for improved distribution performance with visco-elastic fluids
US6187437 *10 Sep 199813 Feb 2001Celanese Acetate LlcProcess for making high denier multilobal filaments of thermotropic liquid crystalline polymers and compositions thereof
US61944839 Nov 199927 Feb 2001Kimberly-Clark Worldwide, Inc.Disposable articles having biodegradable nonwovens with improved fluid management properties
US61959758 Jun 19996 Mar 2001Belmont Textile Machinery Co., Inc.Fluid-jet false-twisting method and product
US61978609 Nov 19996 Mar 2001Kimberly-Clark Worldwide, Inc.Biodegradable nonwovens with improved fluid management properties
US62010689 Nov 199913 Mar 2001Kimberly-Clark Worldwide, Inc.Biodegradable polylactide nonwovens with improved fluid management properties
US620390530 Ago 199520 Mar 2001Kimberly-Clark Worldwide, Inc.Crimped conjugate fibers containing a nucleating agent
US620775511 Ago 199927 Mar 2001Kimberly-Clark Worldwide, Inc.Biodegradable thermoplastic composition
US621129429 Dic 19983 Abr 2001Fu-Jya TsaiMulticomponent fiber prepared from a thermoplastic composition
US624583129 Jun 200012 Jun 2001Kimberly-Clark Worldwide, Inc.Disposable articles having biodegradable nonwovens with improved fluid management properties
US62684349 Nov 199931 Jul 2001Kimberly Clark Worldwide, Inc.Biodegradable polylactide nonwovens with improved fluid management properties
US628140728 May 199928 Ago 2001Kimberly-Clark Worldwide, Inc.Personal care product containing a product agent
US630678225 Ago 199923 Oct 2001Kimberly-Clark Worldwide, Inc.Disposable absorbent product having biodisintegratable nonwovens with improved fluid management properties
US6309377 *8 Feb 199930 Oct 2001Chisso CorporationNon-woven fabric and an absorbent article using thereof
US630998825 Ago 199930 Oct 2001Kimberly-Clark Worldwide, Inc.Biodisintegratable nonwovens with improved fluid management properties
US63482539 Feb 200019 Feb 2002Kimberly-Clark Worldwide, Inc.Sanitary pad for variable flow management
US635039922 Dic 199926 Feb 2002Kimberly-Clark Worldwide, Inc.Method of forming a treated fiber and a treated fiber formed therefrom
US6352772 *20 Ago 19995 Mar 2002ShakespearePapermaking belts comprising striated monofilaments
US63795648 May 200030 Abr 2002Ronald Paul RohrbachMulti-stage fluid filter, and methods of making and using same
US63842973 Abr 19997 May 2002Kimberly-Clark Worldwide, Inc.Water dispersible pantiliner
US639803924 Oct 19974 Jun 2002Alliedsignal Inc.High efficient acid-gas-removing wicking fiber filters
US644061120 Jul 200027 Ago 2002Honeywell International Inc.Microcapillary battery separator including hollow fibers, and storage battery incorporating same
US64412675 Abr 199927 Ago 2002Fiber Innovation TechnologyHeat bondable biodegradable fiber
US64443128 Dic 19993 Sep 2002Fiber Innovation Technology, Inc.Splittable multicomponent fibers containing a polyacrylonitrile polymer component
US645474911 Ago 199824 Sep 2002Kimberly-Clark Worldwide, Inc.Personal care products with dynamic air flow
US646145714 Abr 20008 Oct 2002Kimberly-Clark Worldwide, Inc.Dimensionally stable, breathable, stretch-thinned, elastic films
US646172910 Ago 19998 Oct 2002Fiber Innovation Technology, Inc.Splittable multicomponent polyolefin fibers
US64657123 Ago 200015 Oct 2002Kimberly-Clark Worldwide, Inc.Absorbent articles with controllable fill patterns
US646825531 Ago 200022 Oct 2002Kimberly-Clark Worldwide, Inc.Front/back separation barrier
US647541829 Jun 20005 Nov 2002Kimberly-Clark Worldwide, Inc.Methods for making a thermoplastic composition and fibers including same
US647561821 Mar 20015 Nov 2002Kimberly-Clark Worldwide, Inc.Compositions for enhanced thermal bonding
US647915425 Oct 200012 Nov 2002Kimberly-Clark Worldwide, Inc.Coextruded, elastomeric breathable films, process for making same and articles made therefrom
US648219423 Dic 199919 Nov 2002Kimberly-Clark Worldwide, Inc.Pocket design for absorbent article
US648867027 Oct 20003 Dic 2002Kimberly-Clark Worldwide, Inc.Corrugated absorbent system for hygienic products
US649508028 Jun 200017 Dic 2002Kimberly-Clark Worldwide, Inc.Methods for making water-sensitive compositions for improved processability and fibers including same
US650089729 Dic 200031 Dic 2002Kimberly-Clark Worldwide, Inc.Modified biodegradable compositions and a reactive-extrusion process to make the same
US650645628 Sep 200014 Ene 2003Kimberly-Clark Worldwide, Inc.Method for application of a fluid on a substrate formed as a film or web
US65090925 Abr 199921 Ene 2003Fiber Innovation TechnologyHeat bondable biodegradable fibers with enhanced adhesion
US65341499 Feb 200018 Mar 2003Kimberly-Clark Worldwide, Inc.Intake/distribution material for personal care products
US65444551 Ago 20008 Abr 2003Kimberly-Clark Worldwide, Inc.Methods for making a biodegradable thermoplastic composition
US655212429 Dic 200022 Abr 2003Kimberly-Clark Worldwide, Inc.Method of making a polymer blend composition by reactive extrusion
US657993429 Dic 200017 Jun 2003Kimberly-Clark Worldwide, Inc.Reactive extrusion process for making modifiied biodegradable compositions
US65830758 Dic 199924 Jun 2003Fiber Innovation Technology, Inc.Dissociable multicomponent fibers containing a polyacrylonitrile polymer component
US66082365 May 199819 Ago 2003Kimberly-Clark Worldwide, Inc.Stabilized absorbent material and systems for personal care products having controlled placement of visco-elastic fluids
US661039511 Jun 200126 Ago 2003Honeywell International Inc.Breathable electromagnetic shielding material
US66109034 Nov 199926 Ago 2003Kimberly-Clark Worldwide, Inc.Materials for fluid management in personal care products
US661302822 Dic 19982 Sep 2003Kimberly-Clark Worldwide, Inc.Transfer delay for increased access fluff capacity
US661302928 Abr 19992 Sep 2003Kimberly-Clark Worldwide, Inc.Vapor swept diaper
US6613704 *12 Oct 20002 Sep 2003Kimberly-Clark Worldwide, Inc.Continuous filament composite nonwoven webs
US66174906 Oct 20009 Sep 2003Kimberly-Clark Worldwide, Inc.Absorbent articles with molded cellulosic webs
US663220525 Ago 200014 Oct 2003Kimberly-Clark Worldwide, Inc.Structure forming a support channel adjacent a gluteal fold
US664242926 Jun 20004 Nov 2003Kimberly-Clark Worldwide, Inc.Personal care articles with reduced polymer fibers
US66535244 Dic 200025 Nov 2003Kimberly-Clark Worldwide, Inc.Nonwoven materials with time release additives
US66926036 Oct 200017 Feb 2004Kimberly-Clark Worldwide, Inc.Method of making molded cellulosic webs for use in absorbent articles
US670609217 Abr 200216 Mar 2004Alliedsignal Inc.Chemical/Biological decontamination filter
US670925417 Oct 200123 Mar 2004Kimberly-Clark Worldwide, Inc.Tiltable web former support
US67096231 Nov 200123 Mar 2004Kimberly-Clark Worldwide, Inc.Process of and apparatus for making a nonwoven web
US67529058 Oct 200222 Jun 2004Kimberly-Clark Worldwide, Inc.Tissue products having reduced slough
US675956727 Jun 20016 Jul 2004Kimberly-Clark Worldwide, Inc.Pulp and synthetic fiber absorbent composites for personal care products
US676512512 Feb 199920 Jul 2004Kimberly-Clark Worldwide, Inc.Distribution—Retention material for personal care products
US67674986 Oct 199927 Jul 2004Hills, Inc.Process of making microfilaments
US677705612 Oct 200017 Ago 2004Kimberly-Clark Worldwide, Inc.Regionally distinct nonwoven webs
US67774967 Feb 200117 Ago 2004Honeywell International Inc.Polymeric additives and polymeric articles comprising said additive
US67803578 Nov 200224 Ago 2004Fiber Innovation Technology, Inc.Splittable multicomponent polyester fibers
US67838371 Oct 199931 Ago 2004Kimberly-Clark Worldwide, Inc.Fibrous creased fabrics
US67871845 Dic 20017 Sep 2004Kimberly-Clark Worldwide, Inc.Treated nonwoven fabrics
US679402425 Oct 200021 Sep 2004Kimberly-Clark Worldwide, Inc.Styrenic block copolymer breathable elastomeric films
US67972269 Oct 200128 Sep 2004Kimberly-Clark Worldwide, Inc.Process of making microcreped wipers
US681538324 May 20009 Nov 2004Kimberly-Clark Worldwide, Inc.Filtration medium with enhanced particle holding characteristics
US68381549 Dic 19984 Ene 2005Kimberly-Clark Worldwide, Inc.Creped materials
US683840221 Sep 19994 Ene 2005Fiber Innovation Technology, Inc.Splittable multicomponent elastomeric fibers
US683859027 Jun 20014 Ene 2005Kimberly-Clark Worldwide, Inc.Pulp fiber absorbent composites for personal care products
US684644820 Dic 200125 Ene 2005Kimberly-Clark Worldwide, Inc.Method and apparatus for making on-line stabilized absorbent materials
US68613806 Nov 20021 Mar 2005Kimberly-Clark Worldwide, Inc.Tissue products having reduced lint and slough
US686967031 May 200122 Mar 2005Kimberly-Clark Worldwide, Inc.Composites material with improved high viscosity fluid intake
US688137530 Ago 200219 Abr 2005Kimberly-Clark Worldwide, Inc.Method of forming a 3-dimensional fiber into a web
US688735013 Dic 20023 May 2005Kimberly-Clark Worldwide, Inc.Tissue products having enhanced strength
US689098912 Mar 200110 May 2005Kimberly-Clark Worldwide, Inc.Water-responsive biodegradable polymer compositions and method of making same
US689684330 Ago 200224 May 2005Kimberly-Clark Worldwide, Inc.Method of making a web which is extensible in at least one direction
US689734828 Dic 200124 May 2005Kimberly Clark Worldwide, IncBandage, methods of producing and using same
US690845825 Ago 200021 Jun 2005Kimberly-Clark Worldwide, Inc.Swellable structure having a pleated cover material
US692971423 Abr 200416 Ago 2005Kimberly-Clark Worldwide, Inc.Tissue products having reduced slough
US694619518 Sep 200220 Sep 2005Kimberly-Clark Worldwide, Inc.Compositions for enhanced thermal bonding
US69492884 Dic 200327 Sep 2005Fiber Innovation Technology, Inc.Multicomponent fiber with polyarylene sulfide component
US695810323 Dic 200225 Oct 2005Kimberly-Clark Worldwide, Inc.Entangled fabrics containing staple fibers
US696726128 Dic 200122 Nov 2005Kimberly-Clark WorldwideBandage, methods of producing and using same
US701853127 Ene 200328 Mar 2006Honeywell International Inc.Additive dispensing cartridge for an oil filter, and oil filter incorporating same
US702220123 Dic 20024 Abr 2006Kimberly-Clark Worldwide, Inc.Entangled fabric wipers for oil and grease absorbency
US704502931 May 200116 May 2006Kimberly-Clark Worldwide, Inc.Structured material and method of producing the same
US705315129 Dic 200030 May 2006Kimberly-Clark Worldwide, Inc.Grafted biodegradable polymer blend compositions
US70565801 Abr 20046 Jun 2006Fiber Innovation Technology, Inc.Fibers formed of a biodegradable polymer and having a low friction surface
US711863931 May 200110 Oct 2006Kimberly-Clark Worldwide, Inc.Structured material having apertures and method of producing the same
US715061622 Dic 200319 Dic 2006Kimberly-Clark Worldwide, IncDie for producing meltblown multicomponent fibers and meltblown nonwoven fabrics
US71828638 Jun 200427 Feb 2007Honeywell International, Inc.Additive dispersing filter and method of making
US719478823 Dic 200327 Mar 2007Kimberly-Clark Worldwide, Inc.Soft and bulky composite fabrics
US719478923 Dic 200327 Mar 2007Kimberly-Clark Worldwide, Inc.Abraded nonwoven composite fabrics
US719862119 Dic 20023 Abr 2007Kimberly-Clark Worldwide, Inc.Attachment assembly for absorbent article
US72204787 Nov 200322 May 2007Kimberly-Clark Worldwide, Inc.Microporous breathable elastic films, methods of making same, and limited use or disposable product applications
US727072313 Ago 200418 Sep 2007Kimberly-Clark Worldwide, Inc.Microporous breathable elastic film laminates, methods of making same, and limited use or disposable product applications
US729126430 May 20016 Nov 2007Honeywell International, Inc.Staged oil filter incorporating additive-releasing particles
US731677826 Ene 20048 Ene 2008Honeywell International, Inc.Staged oil filter incorporating pelletized basic conditioner
US732094820 Dic 200222 Ene 2008Kimberly-Clark Worldwide, Inc.Extensible laminate having improved stretch properties and method for making same
US748844120 Dic 200210 Feb 2009Kimberly-Clark Worldwide, Inc.Use of a pulsating power supply for electrostatic charging of nonwovens
US758217822 Nov 20061 Sep 2009Kimberly-Clark Worldwide, Inc.Nonwoven-film composite with latent elasticity
US758538231 Oct 20068 Sep 2009Kimberly-Clark Worldwide, Inc.Latent elastic nonwoven composite
US763574531 Ene 200622 Dic 2009Eastman Chemical CompanySulfopolyester recovery
US764535323 Dic 200312 Ene 2010Kimberly-Clark Worldwide, Inc.Ultrasonically laminated multi-ply fabrics
US764877131 Dic 200319 Ene 2010Kimberly-Clark Worldwide, Inc.Thermal stabilization and processing behavior of block copolymer compositions by blending, applications thereof, and methods of making same
US765165322 Dic 200426 Ene 2010Kimberly-Clark Worldwide, Inc.Machine and cross-machine direction elastic materials and methods of making same
US765582929 Jul 20052 Feb 2010Kimberly-Clark Worldwide, Inc.Absorbent pad with activated carbon ink for odor control
US768564920 Jun 200530 Mar 2010Kimberly-Clark Worldwide, Inc.Surgical gown with elastomeric fibrous sleeves
US76871433 Ene 200730 Mar 2010Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US768768118 May 200130 Mar 2010Kimberly-Clark Worldwide, Inc.Menses specific absorbent systems
US770765515 Dic 20064 May 2010Kimberly-Clark Worldwide, Inc.Self warming mask
US773203927 Nov 20028 Jun 2010Kimberly-Clark Worldwide, Inc.Absorbent article with stabilized absorbent structure having non-uniform lateral compression stiffness
US773635030 Dic 200215 Jun 2010Kimberly-Clark Worldwide, Inc.Absorbent article with improved containment flaps
US779064023 Mar 20067 Sep 2010Kimberly-Clark Worldwide, Inc.Absorbent articles having biodegradable nonwoven webs
US779996821 Dic 200121 Sep 2010Kimberly-Clark Worldwide, Inc.Sponge-like pad comprising paper layers and method of manufacture
US780324431 Ago 200628 Sep 2010Kimberly-Clark Worldwide, Inc.Nonwoven composite containing an apertured elastic film
US781146226 Feb 200712 Oct 2010Honeywell International, Inc.Additive dispersing filter and method of making
US781194925 Nov 200312 Oct 2010Kimberly-Clark Worldwide, Inc.Method of treating nonwoven fabrics with non-ionic fluoropolymers
US781628523 Dic 200419 Oct 2010Kimberly-Clark Worldwide, Inc.Patterned application of activated carbon ink
US782000115 Dic 200526 Oct 2010Kimberly-Clark Worldwide, Inc.Latent elastic laminates and methods of making latent elastic laminates
US783391730 Dic 200416 Nov 2010Kimberly-Clark Worldwide, Inc.Extensible and stretch laminates with comparably low cross-machine direction tension and methods of making same
US783844720 Dic 200123 Nov 2010Kimberly-Clark Worldwide, Inc.Antimicrobial pre-moistened wipers
US787974730 Mar 20071 Feb 2011Kimberly-Clark Worldwide, Inc.Elastic laminates having fragrance releasing properties and methods of making the same
US789299331 Ene 200622 Feb 2011Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US790209416 Ago 20058 Mar 2011Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US79107959 Mar 200722 Mar 2011Kimberly-Clark Worldwide, Inc.Absorbent article containing a crosslinked elastic film
US792339116 Oct 200712 Abr 2011Kimberly-Clark Worldwide, Inc.Nonwoven web material containing crosslinked elastic component formed from a pentablock copolymer
US792339216 Oct 200712 Abr 2011Kimberly-Clark Worldwide, Inc.Crosslinked elastic material formed from a branched block copolymer
US793181715 Feb 200826 Abr 2011Honeywell International Inc.Additive dispensing device and a thermally activated additive dispensing filter having the additive dispensing device
US793194425 Nov 200326 Abr 2011Kimberly-Clark Worldwide, Inc.Method of treating substrates with ionic fluoropolymers
US793219622 Ago 200326 Abr 2011Kimberly-Clark Worldwide, Inc.Microporous stretch thinned film/nonwoven laminates and limited use or disposable product applications
US793892122 Nov 200610 May 2011Kimberly-Clark Worldwide, Inc.Strand composite having latent elasticity
US794381330 Dic 200217 May 2011Kimberly-Clark Worldwide, Inc.Absorbent products with enhanced rewet, intake, and stain masking performance
US799407917 Dic 20029 Ago 2011Kimberly-Clark Worldwide, Inc.Meltblown scrubbing product
US800355330 Oct 200623 Ago 2011Kimberly-Clark Worldwide, Inc.Elastic-powered shrink laminate
US800790412 Ene 200930 Ago 2011Fiber Innovation Technology, Inc.Metal-coated fiber
US801753411 Mar 200913 Sep 2011Kimberly-Clark Worldwide, Inc.Fibrous nonwoven structure having improved physical characteristics and method of preparing
US806695615 Dic 200629 Nov 2011Kimberly-Clark Worldwide, Inc.Delivery of an odor control agent through the use of a presaturated wipe
US81378118 Sep 200820 Mar 2012Intellectual Product Protection, LlcMulticomponent taggant fibers and method
US814827830 Dic 20103 Abr 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US815824422 Dic 201017 Abr 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US816338522 Dic 201024 Abr 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US817819922 Mar 201115 May 2012Eastman Chemical CompanyNonwovens produced from multicomponent fibers
US818769730 Abr 200729 May 2012Kimberly-Clark Worldwide, Inc.Cooling product
US82162031 Ene 200310 Jul 2012Kimberly-Clark Worldwide, Inc.Progressively functional stretch garments
US821695313 Dic 201010 Jul 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US822736213 Dic 201024 Jul 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US823671330 Dic 20107 Ago 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US824733513 Dic 201021 Ago 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US825762822 Dic 20104 Sep 2012Eastman Chemical CompanyProcess of making water-dispersible multicomponent fibers from sulfopolyesters
US826295830 Dic 201011 Sep 2012Eastman Chemical CompanyProcess of making woven articles comprising water-dispersible multicomponent fibers
US827306814 Ene 200825 Sep 2012Dow Global Technologies LlcCompositions of ethylene/alpha-olefin multi-block interpolymer for elastic films and laminates
US827345122 Dic 201025 Sep 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US827770630 Dic 20102 Oct 2012Eastman Chemical CompanyProcess of making water-dispersible multicomponent fibers from sulfopolyesters
US828751026 Jul 201016 Oct 2012Kimberly-Clark Worldwide, Inc.Patterned application of activated carbon ink
US828767731 Ene 200816 Oct 2012Kimberly-Clark Worldwide, Inc.Printable elastic composite
US831404122 Dic 201020 Nov 2012Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US832444530 Jun 20084 Dic 2012Kimberly-Clark Worldwide, Inc.Collection pouches in absorbent articles
US833611516 Feb 201025 Dic 2012Kimberly-Clark Worldwide, Inc.Surgical gown with elastomeric fibrous sleeves
US834996316 Oct 20078 Ene 2013Kimberly-Clark Worldwide, Inc.Crosslinked elastic material formed from a linear block copolymer
US836191311 Feb 200829 Ene 2013Kimberly-Clark Worldwide, Inc.Nonwoven composite containing an apertured elastic film
US837702729 Abr 200519 Feb 2013Kimberly-Clark Worldwide, Inc.Waist elastic members for use in absorbent articles
US838749729 Ene 20105 Mar 2013Kimberly-Clark Worldwide, Inc.Extensible absorbent layer and absorbent article
US838887722 Dic 20105 Mar 2013Eastman Chemical CompanyProcess of making water-dispersible multicomponent fibers from sulfopolyesters
US839890722 Dic 201019 Mar 2013Eastman Chemical CompanyProcess of making water-dispersible multicomponent fibers from sulfopolyesters
US839936816 Oct 200719 Mar 2013Kimberly-Clark Worldwide, Inc.Nonwoven web material containing a crosslinked elastic component formed from a linear block copolymer
US843590813 Dic 20107 May 2013Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US844489513 Dic 201021 May 2013Eastman Chemical CompanyProcesses for making water-dispersible and multicomponent fibers from sulfopolyesters
US844489613 Dic 201021 May 2013Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US847587814 Oct 20082 Jul 2013Dow Global Technologies LlcPolyolefin dispersion technology used for porous substrates
US848642711 Feb 201116 Jul 2013Kimberly-Clark Worldwide, Inc.Wipe for use with a germicidal solution
US851251922 Abr 201020 Ago 2013Eastman Chemical CompanySulfopolyesters for paper strength and process
US851314727 Ago 200820 Ago 2013Eastman Chemical CompanyNonwovens produced from multicomponent fibers
US855189522 Dic 20108 Oct 2013Kimberly-Clark Worldwide, Inc.Nonwoven webs having improved barrier properties
US855737422 Dic 201015 Oct 2013Eastman Chemical CompanyWater-dispersible and multicomponent fibers from sulfopolyesters
US862324713 Dic 20107 Ene 2014Eastman Chemical CompanyProcess of making water-dispersible multicomponent fibers from sulfopolyesters
US863713010 Feb 201228 Ene 2014Kimberly-Clark Worldwide, Inc.Molded parts containing a polylactic acid composition
USRE3991918 May 199913 Nov 2007Kimberly Clark Worldwide, Inc.Heterogeneous surge material for absorbent articles
CN101768804B26 Dic 200818 Abr 2012徐州斯尔克纤维科技股份有限公司异收缩双组份网络复合丝
EP2458085A125 Ene 200830 May 2012Kimberly-Clark Worldwide, Inc.Substrates having improved ink adhesion and oil crockfastness
WO1998022068A121 Nov 199728 May 1998Kimberly Clark CoHeterogeneous surge material for absorbent articles
WO1998036331A1 *13 Feb 199820 Ago 1998Bmp Europ LtdA cleaning element
WO1999056687A130 Abr 199911 Nov 1999Kimberly Clark CoStabilized absorbent material for personal care products and method for making
WO2003003963A23 Jul 200216 Ene 2003Kimberly Clark CoRefastenable absorbent garment
WO2004060244A123 Dic 200322 Jul 2004Kimberly Clark CoAbsorbent products with enhanced rewet, intake, and stain masking performance
WO2004060255A13 Nov 200322 Jul 2004Kimberly Clark CoUse of hygroscopic treatments to enhance dryness in an absorbent article
WO2006073557A19 Nov 200513 Jul 2006Kimberly Clark CoMultilayer film structure with higher processability
WO2009022248A229 Jul 200819 Feb 2009Kimberly Clark CoA disposable respirator with exhalation vents
WO2009022250A229 Jul 200819 Feb 2009Kimberly Clark CoA disposable respirator
WO2009050610A24 Sep 200823 Abr 2009Kimberly Clark CoCrosslinked elastic material formed from a linear block copolymer
WO2009077889A117 Sep 200825 Jun 2009Kimberly Clark CoAntistatic breathable nonwoven laminate having improved barrier properties
WO2009138887A230 Mar 200919 Nov 2009Kimberly-Clark Worldwide, Inc.Latent elastic composite formed from a multi-layered film
WO2011047252A115 Oct 201021 Abr 2011E. I. Du Pont De Nemours And CompanyMonolithic films having zoned breathability
WO2011047264A115 Oct 201021 Abr 2011E. I. Du Pont De Nemours And CompanyArticles having zoned breathability
WO2012080867A110 Nov 201121 Jun 2012Kimberly-Clark Worldwide, Inc.Ambulatory enteral feeding system
WO2012085712A122 Nov 201128 Jun 2012Kimberly-Clark Worldwide, Inc.Sterilization container with disposable liner
WO2013064922A118 Sep 201210 May 2013Kimberly-Clark Worldwide, Inc.Drainage kit with built-in disposal bag
Clasificaciones
Clasificación de EE.UU.428/393, 428/372, 428/400, 428/397, 428/364
Clasificación internacionalD01F6/92, D01F8/14
Clasificación cooperativaD01F6/92, D01F8/14
Clasificación europeaD01F6/92, D01F8/14
Eventos legales
FechaCódigoEventoDescripción
18 Jun 2003REMIMaintenance fee reminder mailed
29 May 2003FPAYFee payment
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1 Jun 1999FPAYFee payment
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17 May 1995FPAYFee payment
Year of fee payment: 4